Getting message I not set

Hi.im getting a message in the messages tab that I is not set,first time ive seen this.what have I not set please

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We will need more details than that Marty

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Hi Amilcarlucas,thank you for your reply,will send screen shot later today

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Sorry for the slow reply Amilcarlucas,here is the 1st error message,


andnow I have this message coming up on simulation wont let me do any thing with the sim missions

Thank you for your help